;;; cl-synth : A software synthesiser for Common Lisp
;;; Copyright (C) 2010  Richard van Roy - (pluijzer [at] gmail [dot] com)

;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.

;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.

;;; You should have received a copy of the GNU General Public License
;;; along with this program.  If not, see <http://www.gnu.org/licenses/>

(in-package :cl-synth)

;; FIXME: When using a list going down in frequency does not
;;        always work properly. Sometimes sound goes up in the
;;        end.

(defun sine (freq duration &optional (amp 1) (samplerate 48000))
  (operate-wave #'* (oscil freq (* duration samplerate) 
	  #'sin
	  (lambda(x) x) samplerate) amp))
	